Pipe-threading machine



March 16. 1926.

L. S. HALL PIPE THREADING MACHINE 4 Sheets-Sheet 1 Filed 001;. 23. 1923INVENTOR L5Llf ,5. HALL BYIS ATTRNEY March 16 1926.

L. S. HALL PIPE THREADING MACHINE Filed 00%. 23. 1923 4 Sheets-Sheet-Z QQ Q 1 1 INVENTOR Lax/5 HALL TOR f March 16 1926'. 1,576,652

| s. HALL PIPE THREADI NG MACHINE Filed Oct. 25. 1923 4 Sheets-Sheet 5LESL/ES. HALL flu; 4

A ORNEY March 16 1926.

L. S. HALL PIPE THREADING MACHINE Filed Oct. 23. 1923 4 Sheets-Sheet 4INVENTOR LESL/f 5. HALL BY )5 g 10% EY I Patented Mar. 16, 1926.

UNITED STATES LESLIE S. HALL, OF

1,576,652 PATENT OFFICE.

BRANTFORD, ONTARIO, CANADA, ASSIGNOR TO WILLIAMS TOOL CORPORATION, OFERIE, PENNSYLVANIA.

IPIPE-THREADING MACHINE.

Application filed October 23, 1923. Serial No. 670,236.

To all whom it may concern:

Be it known that I, LESLIE S. HALL, a subject of the King of GreatBritain, and a resident of the city of Brantford, Province of Ontario,in the Dominion of Canada, have invented certain new and usefulImprovements in a Pipe-Threading Machine, of which thefollowing is adescription, reference being had to the accompanying drawings, whichform a part of this application.

My invention relates to pipe threading machines and particularly to thattype in which means is provided for the automatic recession of thechasers or thread cutting dies, to cut a taper thread on thework.

More specifically my invention has to do with an improved die head andcontrol means therefor.

The shortcomings of the present type of machines of the characterreferred to, are many. My invention contemplates the elimination ofthese shortcomings, and presents a multiplication of novel, useful,practical, and highly desirable feaures both from the standpoint of themanufacturer and the operator of pipe threading machines.

Generally, the object of the invention may be said to be the provisionof a machine which is extremely simple of construction, easy ofoperation, safe, accurate, and positive in its action, and embodyingfeatures and improvements which render it highly desirable to the trade.

' One object-is to provide a die head and control mechanism thereforwhich is self contained and assembled as a single unit, thereby adaptingthe same to practically any pipe threading machine now on the market.

Another object is to simplify and reduce the movements necessary inrunning a machine of this character.

A further object is the arrangement of the control mechanism in a mannerto permit the operator to see at a glance the positions of all workingparts, without changing his position.

A still further and important object is'the provision of a double camcontrol for the recession of the chasers whereby threads of twodifferent tapers may be cut by a simple change operation.

It is also an object to provide clear, plain, and simple indicatingmeans for the various lengths of threads to be cut thereby eliminatingguess work and insuring perfect operation and control even by aninexperienced operator.

Another object is the provision of suitable adjustments for the variousparts, allowing for wear, etc.

A further object and special feature is the arrangement of the controlfor the movement of the head on its guide ways, whereby movement of thecontrol means and of the head is always in the same direction.

Other objects and advantages will be apparent as the descriptionproceeds, reference being had to the accompanying drawings wherein likereference characters indicate like parts.

Figure 1 is a side view of'my improved machine showing in general theorganization of the parts.

Figure 2 is a front view of the die head and controlling means therefor,parts being broken away for clearer illustration of the construction andoperation thereof.

Figure 3 is a side View of the die head, parts of the control mechanismbeing removed for clearness.

Figure 4 is a detail view showing the cam control for taper guide.

Figure 5 is another side view, parts being broken away, showing themethod of travel of the carriage on the ways of the bed.

Figure 6 is a front detail of the cam plate showing in some detail theconstruction and operation of the chasers, parts here also be ing brokenaway for clearness in illustration.

Figure 7 is a detail sectional view taken on the line 7-7 of Figure 6,looking down, showing the connection between the cam plate and thecontrolling mechanism.

Figure 8 is also a detail sectional view showing the manner in which thethrust bar -of the control mechanism is guided.

Referring now more specifically to the figures the reference number "1indicates the body of the machine which carries the chuck 2 rotatablysupported in bearings 3; the driving element 4, control levers 5, changespeed control 6, oil tank 7 a pivoted dumping pan or hopper 8 forcatching the out tings, a tool box 9, and the bed 10 of the machine.These elements are not shown in detail in this application as they arenot included specifically in the invention claimed herein;

Formed on the bed 10 are guideways 11 Eel which slidably support acarriage 12. Baffie plates 13, integral with the carriage, provideprotection for the operator from splashing oil, etc.

Rigidly mounted on the carriage 12, as by bolts 14, is the headconstructed to receive the end of a pipe 16 mounted for rot-ation in thechuck 2. Slidably mounted in radial grooves 17 in the front face of thehead 15 (see Fig. 6), are chaser holders 18 carrying chasers or threadcutting dies 19 which are removably and adjustably secured to saidholders and adapted to be adjusted to ipe engaging position in a mannerabout to e described.

Extending thru the center opening 20 in the head 15 is a flanged ring 21secured to the head as by bolts 22. The flange 23 extends outwardly fromsaid head and at right angles thereto, and on the bearing formed on saidring between the flange and the face of the head is rotatably mounted acam plate 24. The rear face of this plate 24 is provided with camgrooves or channels 25 shown in dotted lines in Figure 6. Guided inthese cam grooves 25 are headed pins 26 carried by the chaser holders18. It will be readily seen then that rotation of the cam plate 24, andconsequent movement of the cam grooves 25, results in a sliding movementof the chaser holders radially with respect to the center opening 20,into which the pipe 16 is inserted to be threaded.

Closure caps 27, removable by the use of a special tool, not shown,provide easy access to the headed pins 26, which when removed, permitthe withdrawal of the holders 18' thru openings 28 provided in theperiphery of the head. A handle 29 on the periphery of the cam plate 24provides means for manually rotating the cam plate. Means to bedescribed is also provided for the automatic rotation of the cam plate24 as the cutting progresses, thus causing a gradual recession of thechasers 19 and cutting a tapered thread on the work.

Secured, as by means of bolts 30, to the side of the carriage 12 is abracket or other support 31 which carries the controlling unit for thehead and carriage.

One of the slideways 11, adjacent the bracket 31, carries on its outerlower face a rack 32 extending practically the length of the bed.Mounted in suitable bearings 33 in the bracket 31 is a shaft 34cariyingat its inner end a pinion 35. Adjacent and parallel to. shaft34, and also suitably journaled in bearings in the bracket 31 is a shortstub shaft 36 carrying at its inner end a pinion 37- meshing with pinionand with rack 32. The shaft 34 has keyed thereto, at 38, a hand wheel 39by means of which said shaft may be rotated, and by virtue of the doublepinion connection with the rack 32 and the bracket connection with thecarriage 12, it

will be readily seen that rotation of the hand wheel 39 results inmovement of the carriage and head on the ways 11 in the same directionas the hand Wheel is rotated. Conversely, it will be seen that uponmovement of the head and carriage along the ways 11, due to thethreading operation after the work has begun, the shaft 34 will berotated. It wil be noted in this connection that since the controlmechanism is carried by the carriage, said carriage and said controlmechanism move together and both are at all times directly in front ofthe operator manipulating the control.

Loosely mounted on the shaft 34 is a sleeve 40 which carries at itsinner end a disk 41 provided on its inner face with one or more camgrooves 42. The outer end of the sleeve 40 is provided with a hand wheel43 by means of which said sleeve and said cam disk may be manuallyrotated. This hand wheel 43 carries an inwardly projecting stop piece 44adapted to engage with an adjustable stop screw 45 mounted in the pathof said stop piece 44 by means of an upstanding lug 46 carried by thebracket 31. The rotation of the hand wheel 43 is thus adjustablylimited.

A look handle or wheel 47 is screw threaded upon the outer end of shaft34 and when tightened thereon serves to frictionally lock the hand wheel39 and the hub 48 of hand wheel 43 together, whereby rotation of oneimparts rotation to the other.

Suitably mounted in the bracket 31, and bearing against disk 41, (seeFig. 2), is a small, slidable spring pressed plunger 49 provided with atension adjusting screw 50, the device forming a friction'brake or dragon the disk 41 and preventing accidental or undue rotation thereof.

A connection is provided between the rotatable cam disk 41 and the camplate 24 whereby rotation of one imparts rotation to the other. Thisconnection is in the form of a thrust bar 51 provided at its lower endwith a roller 52 which rides in one of the cam grooves 42 in the disk41. This thrust bar extends upwardly, guided thru the bracket 31 onthree sides by means of a channel 53, (see Fig. 8), and on the fourthside by the face 54 of the carriage 12. I

A bolt 55 presses thru the thrust bar at its upper end, (see Fig. 7),and slidable on the inner end of this bolt 55, between the thrust barand head 15, is an eye bolt 56, the shank of which extends at rightangles to the bolt 55. Mounted upon the shank of the eye bolt 56 is asleeve or bushing 57 upon which swivels a piece 58 having connectionwith the cam plate 24 by means of V extension 59 engaging in acorresponding V slot 60 in the rear edge of the cam plate 24. A clampplate 61 with a lip 62 overhanging the face of cam plate 24, and a nut63, serve to clamp and hold the piece 58 in its adjusted position on thecam late 24. Such adjustment is made by first oosening the nut 63,grasping the handle 29 on the cam plate and turning the same therebyto'the desired position, (pipe engaging position of the chasers 19), andthen locking said nut 63 again. An indicator member 64 mounted on thehead 15, points to indicating numbers 65 on the edge of the cam plate,for showing the operator at a glance and without changing his positionthe correct setting of the chasers for the desired size of pipe, in themanner just described.

It will be readily understood therefore, that movement of the thrust bar51, up or down, will result in rotation of the cam plate 24 andconsequent radial movement of the chasers. It will also be understoodfrom the foregoing that due tothe lock wheel 47 and the frictionalengagement between the hand wheel 39 and the hub 48 of hand wheel 43,the cam disk controlling the chaser holders may be selectively rotatedmanually, independent of the movement of the .carriage, or automaticallyrotated by the movement of the carria e.

The cam disk 41 is bevelled at its edge, as

at 66, such bevelled edge carryingindicat ing characters 67 which arevisible to the operator through a window or sight opening 68 in thebracket 31. A fixed pointer 'or other suitable indicator 69' is securedto the bracket 31 centrally of the sight opening, and past which theindicating numbers 67 pass. B means of this indicating arrangement theoperator can always see at a glance and without-changing his position'atthe control mechanism, the progress of the work for any given size ofpipe, degree and length of taper being cut, and the exact moment torelease the dies from their cutting. This is a distinct advantage forguess work is eliminated and an experienced o erator is unnecessary inthe running of t e machine.

Preferably two of the cam grooves 42 are provided in the disk 41, onehaving a curvature which, acting thru its thrust bar connection with thecam plate, causes a thread of a standard taper to be cut on pipe ofdesired sizes. The second groove permits a thread of a different taperto be cut on pipe requiring. a special taper, such as casings, etc.

Each groove is provided with an outlet 70 in the edge of the disk 41 sothat by turning the disk until the desired outlet is at the top, it is asimple operation to lift the thrust bar roller out of one groove andinto the other, thus almost instantlv setting the control for a newtaper cut. The advantage of this arrangement is obvious.

The hand wheel 71 controls the V centering blocks, (not shown),slidingly mounted on the back of head 15 for steadying the pipe duringthe reaming and cutting off operations. The hand wheel or lever ,72controls the cuttingoff tool, (also not shown), carried by one of theaforementioned centering Vs. The lever 73 controls the reaming tool,(not shown), mounted adjacent the cutting ofi' tool. These parts 'donotform a part of the invention clalmed in this application and aretherefore not shown in detail.

The operation of the machine and parts described is as follows:

The operator having a length of pipe to be threaded, first loosens thenut 63, and by means of handle 29 sets the cam plate in the properposition for that particular size of pipe. The indicator 64 and 65 showshim at a glance when the setting is cor- 'to the die head control ordisk 41. The carriage is then moved forward by means of the hand wheel39, which also causes the cam disk 41 to rotate, thereby startingthechasers to recede b means of the thrust bar connection with tile camplate. The pipe is, of course, rotating and as soon as the chasers havetaken enough'hold on the pipe to pull the head forward theoperator mayrelease the hand pressure on the wheel 39 and let the carriage feedforward itself.

As soon as the indicating numbers 67 on the disk 41 representing thesize of pipe being cut appear op osite the pointer 69 in the window 68,a nil length of thread has been cut, with a taper controlled by the camgroove 42. The operator should now release the lock lever or wheel 47and rotate the hand wheel 43. This will then release the' chasers fromthe pipe and also open the head suflicient to allow the pipe to passthru without touching the chasers. The operator can now try his fitting,cut off the pipe, or perform any other operation necessary.

Change from one taper to another is almost instantaneous. The cam diskis simply revolved to the farthest point possible on that cam, andthethrust bar and roller which operates in the cam can be lifted clearof the disk and dropped into the other groove.

It will be seen that the control mechanism for my new head is selfcontained and made up as a unit. This enables the application of thedesirable features of the control to practically all pipe threadingmalength of thread to be cut, and the taper is all figured out andmarked in large plain figures under the eye of the operator, leaving nooperation to his udgment. It is not necessary to look in the front tosee when the pipe is taking hold. Neither is it necessary to look intothe rear to see when the proper length of thread has been out, which issometimes very hard to do owing to the fact that cuttings and dark oiloften cover up the pipe and make it impossible to tell exactly when aperfect thread has been cut.

The adjusting screw 45 allows for wear on the parts and permits accuratework at all times.

From the foregoing it will be readily understood that I have devised amachine.

which is novel, useful, practical, highly efficient, and a distinctadvance in the art to which it pertains. Of course, the exact form shownand described herein is to be taken as illustrative only, for obviouslythe various parts are susceptible to various changes and modificationswithout departing from the scope of the invention. I do not wish to belimited therefore, to the form shown, other than by the appended claims.

I claim 1. In a threading machine, a movable carriage thereon carrying ahead, slidable chaser holders in said head, means for imparting movementto said head, rotatable means connected to and operated by said carriagemoving means for controlling the movement of said chaser holders, andmeans for operating said rotatable means independent of the carriagemoving means.

2. In a threading machine, a slidable carriage thereon carrying a head,slidable chaser holders in said head, a cam plate on said head forimparting movement to said chaser holders, a rotatable disk providedwith a cam groove carried by said carriage for controlling the movementof said chaser holders to a predetermined degree, and connectionsbetween said cam groove and said cam plate.

3. In a threading machine, a slidable cariiage thereon carrying a head,slidable chaser holders in said head, a cam plate on said head forimparting movement to said chaser holders, a rotatable disk providedwith a cam groove carried by said carriage for controlling the movementof said chaser holders to a predetermined degree, and connectionsbetween said cam groove and said cam plate, and means independent ofsaid rotatable disk for manually operating said cam plate.

4. In a threading machine, a slidable carriage thereon carrying a head,slidable chaser holders in said head, a cam plate on said head forimparting movement to said chaser holders, a rotatable disk providedwith ,a cam groove carried by said carriage for controlling the movementof said chaser holdeisto a predetermined degree, and connections betweensaid cam groove and said cam plate, and means whereby movement of saidcarriage results in movement of said chaser holders, said last namedmovement being automatically controlled by said rotatable disk.

5. In a threading machine, a slidable carriage thereon carrying a head,slidable chaser holders in said head, a single unit of mechanism carriedby said carriage compris ing; means for moving said carriage, means forautomatically and manually controlling the movement of said chaserholders, and means for locking said two last named means together,whereby movement of said carriage results in movement of said chaserholders controlled by said control means.

6. In a threading machine, a slidable carriage thereon carrying a head,slidable chaser holders in said head, a cam plate on said head forimparting movement to said chaser holders, a rotatable disk on saidcarriage for controlling the movement of said cam plate, and means insaid disk for selectively controlling such movement to a plu rality ofpredetermined degrees.

7 In a threading machine, a slidable carriage thereon carrying a head,slidable chaser holders in said head, a cam plate on said head forimparting movement to said chaser holders, a rotatable disk on saidcarriage for controlling the movement of said cam plate, and means insaid disk for selectively controlling such movement to a plurality ofpredetermined degrees, said means comprising a plurality of cam grooves,and connecting means between said grooves and said cam plate. v

8. In a threading machine, a slidable carriage thereon carrying a head,slidable chaser holders in said head, a cam plate on said head forimparting movement to said chaser holders, a bracket on said carriage,carrying a rotatable disk for controlling the movement of said camplate, a thrust bar connection between said disk and said cam plate,said thrust bar being guided through a channel in said bracket.

9. In a threading machine, a slidable carriage thereon carrying a head,slidable chaser holders in said head, a cam plate on said head forimparting movement to said chaser holders, a rotatable disk on saidcarriage provided with a cam groove for controlling the movement of saidcam plate to a predetermined degree, a thrust bar connecting said camgroove and said cam plate, said thrust bar having a roller at its lowerend for engaging in said cam groove.

10. In a threading machine, a slidable carriage thereon carrying a head,slidable chaser holders in saidhead, a cam plate on said head forimparting movement to said chaser holders. a rotatable disk on saidcarriage provided with a plurality of cam grooves, a thrust baradjustably secured at one end to said cam plate and provided with aroller at its opposite end for selective engagement with one of said camgrooves, whereby the movement of said chaser holders is controlled to aselected predetermined degree.

11. In a threading machine, a slidable carriage thereon carrying a head,a slidable chaser holders in said head, a cam plate on said head forimparting movement to said chaser holders, rotatable means carried byaaid carriage for controlling the movement of said chaser holders, aconnection between said rotatable means and said cam plate, and afriction tension brake bearing on said rotatable means.

12. In a threading machine, a slidable carriage thereon carrying a head,slidable chaser holders in said head, a cam plate on said head forimparting movement to said chaser holders, a bracket on said carriagesupporting a rotatable controlling means for the movement of said camplate, means on said bracket for rotating said rotatable means, and astop means on said bracket for limiting such rotation.

13. In a threading machine, a slidable carriage thereon carrying a head,slidable chaser holders in said head, a cam plate on said head forimparting movement to said chaser holders, a bracket on said carriagesupporting a rotatable controlling means for the movement of said camplate, means on said bracket for rotating said rotatable means, and anadjustable stop means on said bracket for limiting such rotation.

14;. In a threading machine, a slidable carriage thereon carrying ahead, slidable chaser holders in said head, a cam plate on said head forimparting movement to said chaser holders, a bracket on said carriagesupporting a rotatable disk for controlling to a predetermined degreethe movement of said cam plate, said disk having a bevelled edge andindicating characters thereon.

LESLIE S. HALL.

